Do not generate a predicate if we did not actually improve anything.
Do not generate a predicate if we did not actually improve anything.

HIPERFIT/futhark,mrakgr/futhark,ihc/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,HIPERFIT/futhark,diku-dk/futhark,ihc/futhark,CulpaBS/wbBach,mrakgr/futhark,diku-dk/futhark,mrakgr/futhark,ihc/futhark,diku-dk/futhark